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Corundum
A crystalline form of aluminium oxide known in the gemstone world as ruby and sapphire. It is naturally clear, but can have different colours when impurities are present. Corundum is much admired for its hardness (9.0 on the Mohs scale) and brilliance and excellent wearability.
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- Part of Speech: noun
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- Industry/Domain: Fashion
- Category: General jewelry; Gemstones
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